I have a 1971 F250 Highboy, 4 wheel drum, that I can't get good pedal or brakes. They were good before, replaced a rear line, and now my brakes suck. I have bled multiple time with no luck. I have the rear of the master going to the front, and the front of the master going to the rear wheel cylinders. I noticed I get a 6" stream when I crack the rear, and only 2" from the front. Does this mean my master is bad?